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12c Release 1 (12.1)

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8 Oracle Data Guard Broker Properties

This chapter describes the various configuration and database properties that help you view and control the behavior of entire broker configurations, individual configuration members, redo transport services, and log apply services.

This chapter discusses the following topics:

Properties have either configuration-wide scope, database-wide scope, far sync instance-wide scope, or instance-specific scope. Configuration-wide properties control the behavior of the broker on all members of the configuration. The values of such properties apply uniformly across all members of the configuration.

Database-wide properties allow you to view or control the behavior of a specific database. If the database (primary or standby) is an Oracle RAC database consisting of multiple instances, the value of such a property applies uniformly across all instances of that database.

Far sync instance-wide properties allow you to view or control the behavior of a far sync instance.

Instance-specific properties allow you to view or control the behavior of an individual database instance. Such a property exists for all instances of an Oracle RAC database, but its value may differ from one specific instance to another.

Note:

This chapter presents properties primarily from the point of view of the Oracle Data Guard command-line interface (DGMGRL). Using DGMGRL, the properties described in this chapter may be viewed or modified using discrete DGMGRL commands.

Enterprise Manager explicitly presents some of these properties on the Edit Properties page. Information from other properties may be implicitly incorporated into other Web pages displayed by Enterprise Manager. Each property's description in this chapter indicates how Enterprise Manager presents that property.

8.1 Configuration Properties

Configuration properties control the behavior of the broker configuration. You can view and dynamically update the values of these properties using either DGMGRL or Enterprise Manager. However, some properties can only be updated through DGMGRL.

A configuration property has configuration-wide scope; meaning that the value you set for the property applies uniformly to each member in the configuration.

The following sections describe the configuration properties:

8.1.1 BystandersFollowRoleChange

The BystandersFollowRoleChange configuration property establishes whether bystander standby databases are evaluated during failover (value = ALL) or after failover (value = NONE).

  • ALL - During the failover process, the broker determines whether the bystander standby databases are ahead of or behind the failover target standby (that is, the standby that will be the new primary).

    If the bystander standbys are ahead, they will be disabled with a status of ORA-16661 as part of the failover operation. The bystander standbys must be reinstated after failover completes. The broker reinstates a standby through a flashback to the SCN at which the target standby became a primary database, and sets up the redo transport configuration from the new primary to the standby.

    If the bystander standbys are behind, then the broker simply sets up the redo transport configuration from the soon-to-be-new-primary to these standbys and completes the failover process.

  • NONE - During the failover process, the broker does NOT evaluate the status of the bystander standbys as part of the failover operation. They are marked as disabled with a status of ORA-16661 so that they can be evaluated later. The broker simply completes the failover to produce a new primary database as soon as possible.

    After the failover is completed, you can reinstate the bystander standbys. During reinstatement of a bystander, the broker determines whether the bystander is ahead of, or behind, the new primary. If the bystander is ahead of the new primary, then the broker automatically flashes back the standby to the SCN at which the target standby became a primary database and sets up redo transport from the new primary to the standby. (Even if a flashback is not required, the broker sets up the redo transport configuration from the new primary to these standbys.)

    The NONE option decreases the processing time for failover, but disables broker management of all bystander databases in the configuration. If fast-start failover is enabled, then the observer automatically reinstates the standby databases after failover has completed. Otherwise, you will have to manually reinstate the standby databases after failover has completed.

Category Description
Datatype String
Valid value ALL or NONE
Broker default ALL
Imported? No
Parameter class Not applicable
Role Primary and standby
Standby type Not applicable
Corresponds to Not applicable
Scope Broker configuration. This property will be consumed by broker on the database that is the target of a complete failover.
Enterprise Manager name Not applicable

8.1.2 CommunicationTimeout

The CommunicationTimeout configuration property allows you to decide how many seconds the broker should wait before timing out its network communication between members in the configuration. A value of zero indicates that a network communication should never be timed out.

Category Description
Datatype Integer
Valid values >= 0
Broker default 180 seconds
Imported? No
Parameter class Not applicable
Role Primary and standby
Standby type Not applicable
Corresponds to Not applicable
Scope Broker configuration. This property will be consumed by broker on all databases in the configuration.
Enterprise manager name Not applicable

8.1.3 FastStartFailoverAutoReinstate

The FastStartFailoverAutoReinstate configuration property causes the former primary database to be automatically reinstated if a fast-start failover was initiated because the primary database was either isolated or had crashed. To prevent automatic reinstatement of the former primary database in these cases, set this configuration property to FALSE.

The broker never automatically reinstates the former primary database if a fast-start failover was initiated because a user configuration condition was detected or was requested by an application calling the DBMS_DG.INITIATE_FS_FAILOVER function.

Category Description
Datatype Boolean
Valid value TRUE or FALSE
Broker default TRUE
Imported? No
Parameter class Not applicable
Role Primary and standby
Standby type Not applicable
Corresponds to Not applicable
Scope Broker configuration. This property will be consumed by the observer after fast-start failover has been enabled.
Enterprise Manager name Automatically Reinstate Primary

8.1.4 FastStartFailoverLagLimit

The FastStartFailoverLagLimit configuration property establishes an acceptable limit, in seconds, that the standby is allowed to fall behind the primary in terms of redo applied, beyond which a fast-start failover will not be allowed. The lowest possible value is 10 seconds.

This property is used when fast-start failover is enabled and the configuration is operating in maximum performance mode.

Category Description
Datatype Integer
Valid value Integral number of seconds. Must be greater than, or equal to, 10.
Broker default 30 seconds
Imported? No
Parameter class Not applicable
Role Primary and standby
Standby type Not applicable
Corresponds to Not applicable
Scope Broker configuration. This property will be consumed by the primary database after fast-start failover has been enabled.
Enterprise Manager name Lag Limit

8.1.5 FastStartFailoverPmyShutdown

The FastStartFailoverPmyShutdown configuration property causes the primary database to shut down if fast-start failover is enabled and V$DATABASE.FS_FAILOVER_STATUS indicates the primary has been STALLED for longer than FastStartFailoverThreshold seconds. In such a situation, it is likely that the primary has been isolated and a fast-start failover has already occurred. A value of TRUE helps to ensure that an isolated primary database cannot satisfy user queries.

Setting this property to FALSE will not prevent the primary database from shutting down if a fast-start failover occurred because a user configuration condition was detected or was requested by an application by calling the DBMS_DG.INITIATE_FS_FAILOVER function.

Category Description
Datatype Boolean
Valid value TRUE or FALSE
Broker default TRUE
Imported? No
Parameter class Not applicable
Role Primary and standby
Standby type Not applicable
Corresponds to Not applicable
Scope Broker configuration. This property will be consumed by the primary database after fast-start failover has been enabled.
Enterprise Manager name Automatically Shutdown Primary

8.1.6 FastStartFailoverThreshold

The FastStartFailoverThreshold configuration property defines the number of seconds the observer attempts to reconnect to the primary database before initiating a fast-start failover to the target standby database. The time interval starts when the observer first loses connection with the primary database. If the observer is unable to regain a connection to the primary database within the specified time, then the observer initiates a fast-start failover. See Step 4 in Section 5.5.2 for more information about setting this property.

The observer ignores the threshold completely if a configurable fast-start failover condition is detected or an application has requested that fast-start failover be initiated.

Category Description
Datatype Integer
Valid value Integral number of seconds. Must be greater than, or equal to, 6.
Broker default 30 seconds
Imported? No
Parameter class Not applicable
Role Target standby database that is about to fail over to the primary role
Standby type Not applicable
Corresponds to Not applicable
Scope Broker configuration. This property will be consumed by the observer after fast-start failover has been enabled.
Enterprise Manager name Oracle Enterprise Manager Cloud Control presents this as "Failover Threshold" on the Oracle Data Guard Overview page.

8.1.7 ObserverOverride

The ObserverOverride configuration property, when set to TRUE, allows an automatic failover to occur when the observer has lost connectivity to the primary, even if the standby has a healthy connection to the primary.

Category Description
Datatype Boolean
Valid values TRUE or FALSE
Broker default FALSE
Imported? No
Parameter class Not applicable
Role Primary and standby
Standby type Not applicable
Corresponds to Not applicable
Scope Broker configuration. This property will be consumed by the observer after fast-start failover has been enabled.
Enterprise Manager name Not applicable

8.1.8 ObserverReconnect

The ObserverReconnect configuration property specifies how often the observer establishes a new connection to the primary database. When this property is set to the default value of 0, the observer creates and maintains a connection to the primary database, but it does not periodically create a new connection to the primary database. While this eliminates the processing overhead associated with periodically establishing a new observer connection to the primary database, it also prevents the observer from detecting that it is not possible to create new connections to the primary database. Oracle recommends that this property be set to a value that is small enough to allow timely detection of faults at the primary database, but large enough to limit the overhead associated with periodic observer connections to an acceptable level.

Category Description
Datatype Integer
Valid values >=0
Broker default 0
Imported? No
Parameter class Not applicable
Role Primary and standby
Standby type Not applicable
Corresponds to Not applicable
Scope Broker configuration. This property will be consumed by the observer after fast-start failover has been enabled.
Enterprise Manager name Not applicable

8.1.9 OperationTimeout

The OperationTimeout configuration property specifies the maximum amount of time the broker should wait for health check, get monitorable property, and set property operations to complete.

Category Description
Datatype Integer
Valid values >= 30 and <= 600
Broker default 30 seconds
Imported? No
Parameter class Not applicable
Role Primary and standby
Standby type Not applicable
Corresponds to Not applicable
Scope Broker configuration. This property will be consumed by broker on all databases in the configuration.
Enterprise Manager name Not applicable

8.1.10 TraceLevel

The TraceLevel configuration property is used to control the amount of tracing performed by the broker for every member in the configuration. Setting the property to USER limits the tracing to completed operations and to any warning or error messages resulting from an operation or health check. Setting the property to SUPPORT increases the amount of tracing to include lower-level information needed by Oracle Support Services.

Category Description
Datatype String
Valid values USER, SUPPORT
Broker default USER
Imported? No
Parameter class Not applicable
Role Primary and standby
Standby type Not applicable
Corresponds to Not applicable
Scope Database
Enterprise Manager name Not applicable

8.2 Monitorable (Read-Only) Properties

Monitorable properties allow you to view information related to the database, database instance, or far sync instance, but you cannot change the values of these properties. You can view all of the monitorable properties using the DGMGRL SHOW commands.

Note:

Information for monitorable properties can be seen only when broker management of the entity is enabled. Enterprise Manager displays the information obtained from these properties on the Property page.

If the database is an Oracle RAC database, the output values of some properties may also show instance-specific information. For example if the primary database is an Oracle RAC database, LogXptStatus may show Instance1 transmitting redo data to Standby2 has an error and Instance2 transmitting redo data to Standby4 has an error.

The following sections describe the monitorable properties:

8.2.1 InconsistentLogXptProps (Inconsistent Redo Transport Properties)

The InconsistentLogXptProps monitorable property returns a table that shows all properties related to redo transport services whose values are inconsistent between the broker configuration file and the runtime value.

Although the properties reported in this table are database-specific or far sync instance-specific properties, the inconsistency is reported on an instance-specific basis. A database or far sync instance-specific property only ensures that there is one value in the broker's configuration file for all instances of the database or far sync instance, but the runtime values can be different. This means that a database or far sync instance-specific property may be inconsistent only on some instances.

This property pertains to the primary database, a physical standby database that ships redo data, or a far sync instance. The table contains the following columns:

  • INSTANCE_NAME

    The value identifying the SID for the instance.

  • STANDBY_NAME

    The database unique name (DB_UNIQUE_NAME) of the standby database or far sync instance to which this redo transport services property pertains.

  • PROPERTY_NAME

    The name of the redo transport services property with an inconsistent value.

  • MEMORY_VALUE

    The runtime value being used in the database or far sync instance.

  • BROKER_VALUE

    The value of the redo transport services property saved in the broker configuration file.

8.2.2 InconsistentProperties (Inconsistent Properties)

The InconsistentProperties monitorable property returns a table that shows all properties whose values contained in the broker configuration file are inconsistent with the values in the corresponding server parameter file or the runtime values.

Although the properties reported in this table are database-specific or far sync instance-specific properties, the inconsistency is reported on an instance-specific basis. A database or far sync instance-specific property only ensures that there is one value in the broker's configuration file for all instances of the database or far sync instance, but the runtime values can be different. This means that a database or far sync instance-specific property may be inconsistent only on some instances

Each individual configuration member has this property. The table contains the following columns:

  • INSTANCE_NAME

    The value identifying the SID for the instance.

  • PROPERTY_NAME

    The name of the property with the inconsistent value.

  • MEMORY_VALUE

    The corresponding runtime value being used.

  • SPFILE_VALUE

    The corresponding value saved in the server parameter file (SPFILE).

  • BROKER_VALUE

    The value of the property saved in the broker configuration file.

8.2.3 LogXptStatus (Redo Transport Status)

The LogXptStatus monitorable property returns a table that contains the error status of redo transport services for each of the enabled configuration members. This property pertains to the primary database, a physical standby database that ships redo data, or a far sync instance.

The table contains the following columns:

  • PRIMARY_INSTANCE_NAME

    The value identifying the SID for the instance on the primary database.

  • STANDBY_DATABASE_NAME

    The database unique name (DB_UNIQUE_NAME) of the standby database or far sync instance.

  • ERROR

    The text of the redo transport error. If there is no error, the field is empty.

Each entry in the table indicates the status of redo transport services on one redo source to one redo destination.

The error status can be an empty string, which indicates there is no error.

In the following example, the STATUS from South_Sales is empty because there is no error for the South_Sales destination. The South_Report destination returned the ORA-01034 message.

DGMGRL> SHOW DATABASE 'North_Sales' 'LogXptStatus' ;
LOG TRANSPORT STATUS
PRIMARY_INSTANCE_NAME STANDBY_DATABASE_NAME               STATUS
         north_sales1           South_Sales
         north_sales1          South_Report    ORA-01034: ORACLE not available

8.2.4 LsbyFailedTxnInfo (Logical Standby Failed Transaction Information)

The LsbyFailedTxnInfo monitorable property identifies a failed transaction that caused log apply services to stop. This property contains a string with the following values from the DBA_LOGSTDBY_EVENTS view:

  • XIDUSN: Transaction ID undo segment number

  • XIDSLT: Transaction ID slot number

  • XIDSQN: Transaction ID sequence number

  • STATUS_CODE: Status (or Oracle error code) belonging to the STATUS message

  • STATUS: Description of the current activity of the process or the reason why log apply services stopped

The transaction IDs and status information are separated by a string of number signs (###).

This property pertains to a logical standby database.

8.2.5 LsbyParameters (Logical Standby Parameters)

The LsbyParameters monitorable property contains a string that identifies the value of MAX_SGA (maximum system global area) and MAX_SERVERS (maximum number of parallel query servers) specifically reserved for log apply services. These values are separated by a string of number signs (###) in the LsbyParameters property.

This property pertains to a logical standby database.

8.2.6 RecvQEntries (Receive Queue Entries)

The RecvQEntries monitorable property returns a table indicating all log files that were received by the standby database but have not yet been applied. If no rows are returned, it implies all log files received have been applied. This property pertains to a standby database.

The table contains the following columns in the order shown:

  • STATUS

    The STATUS column is set to one of the following values for a log file on a logical standby database:

    • NOT_APPLIED: No redo records in this log file have been applied.

    • PARTIALLY_APPLIED: Some of the redo records in this log file have been applied while others have not.

    • COMMITTED_TRANSACTIONS_APPLIED: This status value only applies to a logical standby database. All redo records belonging to the committed transactions have been applied. Redo records belonging to uncommitted transactions have not been read by LogMiner and may still be needed when the transactions are committed in the future. Therefore, it is not safe yet to discard this online redo log file.

  • RESETLOGS_ID

    Resetlogs identifier associated with the archived redo log file

  • THREAD

    The redo thread number

  • LOG_SEQ

    The online redo log file sequence number

  • TIME_GENERATED

    The first time when the online redo log file was written to the primary database

  • TIME_COMPLETED

    The next time when the log file was archived on the primary database (corresponds to the NEXT_CHANGE# column)

  • FIRST_CHANGE#

    First change number in the archived redo log file

  • NEXT_CHANGE#

    First change in the next log file

  • SIZE (KBs)

    The SIZE of the online redo log file in kilobytes

For example:

DGMGRL> SHOW DATABASE 'South_Sales' 'RecvQEntries' ;
              STATUS     RESETLOGS_ID           THREAD
LOG_SEQ          TIME_GENERATED       TIME_COMPLETED    FIRST_CHANGE#
NEXT_CHANGE#        SIZE (KBs)
         NOT_APPLIED        497198843                1                    5
06/20/2003 14:55:38  06/20/2003 16:31:26           202138
210718             7364
         NOT_APPLIED        497198843                1                    6
06/20/2003 16:31:26  06/20/2003 16:31:39           210718
210753               13
         NOT_APPLIED        497198843                1                    7
06/20/2003 16:31:39  06/20/2003 16:31:54           210753
210758                1
         NOT_APPLIED        497198843                1                    8
06/20/2003 16:31:54  06/20/2003 16:31:59           210758
210789               11

Note:

Enterprise Manager displays this information on the Log File Details page.

8.2.7 SendQEntries (Send Queue Entries)

The SendQEntries monitorable property returns a table that shows all log files on the primary database that were not successfully archived to one or more standby databases. This property pertains to the primary database.

The table contains the following columns:

  • STANDBY_NAME

    The value can be empty or it can contain the database unique name (DB_UNIQUE_NAME) of a standby database. If empty, the STATUS column will contain a value of CURRENT or NOT_ARCHIVED.

  • STATUS

    The STATUS column is set to one of the following values:

    • CURRENT: A log file to which online redo is currently being written.

    • NOT_ARCHIVED: A completed online redo log file that has not been archived locally.

    • ARCHIVED: A completed log file that has been archived locally but has not been transmitted to the standby database specified in the STANDBY_NAME column.

    The table contains exactly one row with the value of STATUS=CURRENT. There can be multiple rows with the value STATUS=ARCHIVED or STATUS=NOT_ARCHIVED.

  • RESETLOGS_ID

    Resetlogs identifier associated with the archived redo log file

  • THREAD

    The redo thread number.

  • LOG_SEQ

    The log sequence number. Multiple rows may have the same LOG_SEQ value (for different STANDBY_NAME values).

  • TIME_GENERATED

    The first time when the online redo log file was written to the primary database.

  • TIME_COMPLETED

    The next time when the log file was archived on the primary database (corresponds to the NEXT_CHANGE# column).

  • FIRST_CHANGE#

    First change number in the archived redo log file.

  • NEXT_CHANGE#

    First change in the next log file.

  • SIZE (KBs)

    The SIZE of the online redo log file in kilobytes.

For example, the following shows output from a SHOW DATABASE command:

DGMGRL> SHOW DATABASE 'North_Sales' 'SendQEntries' ;
PRIMARY_SEND_QUEUE
        STANDBY_NAME       STATUS     RESETLOGS_ID
THREAD              LOG_SEQ       TIME_GENERATED       TIME_COMPLETED
FIRST_CHANGE#     NEXT_CHANGE#       SIZE (KBs)
       South_Sales   ARCHIVED        497198843
1                    9  06/20/2003 16:31:59  06/20/2003 16:39:57
210789           211411              186
       South_Sales   ARCHIVED        497198843
1                   10  06/20/2003 16:39:57  06/20/2003 16:40:01
211411           211415                1
       South_Sales   ARCHIVED        497198843
1                   11  06/20/2003 16:40:01  06/20/2003 16:40:07
211415           211418                1
                          CURRENT        497198843
1                   12  06/20/2003 16:40:07
211418                                 1

Note:

Enterprise Manager displays this information on the Log File Details page.

8.2.8 TopWaitEvents

The TopWaitEvents monitorable property specifies the 5 events with the longest waiting time in the specified instance. The events and their waiting time are retrieved from V$SYSTEM_EVENT. Each instance in the configuration has this property. This property is an instance-specific monitorable property. The table contains the following columns in the order shown:

  • Event

    The system wait event.

  • Wait Time

    The total amount of time waited for this event in hundredths of a second.

The following example shows output from a SHOW INSTANCE command:

DGMGRL> SHOW INSTANCE north_sales1 'TopWaitEvents';
TOP SYSTEM WAIT EVENTS
               Event            Wait Time
   rdbms ipc message               671350
SQL*Net message from client         62390
          pmon timer                47897
  Queue Monitor Wait                43016
 wakeup time manager                38508

8.3 Configurable Properties

Configurable properties control the behavior of broker configuration members. You can view and dynamically update the values of these properties using either DGMGRL or Enterprise Manager. However, some properties can only be updated through DGMGRL.

These properties control certain database initialization parameters and SQL statements that the broker uses to manage an Oracle Data Guard broker configuration. Therefore, you should not manually set those initialization parameters or issue those SQL statements on a broker configuration. See "Broker Controlled Database Initialization Parameters and SQL Statements".

In most cases, the configurable property is said to apply to the entire member, meaning the value you set for the property applies to each instance of the member (that is, database or far sync instance). However, in a few cases, the configurable property is said to have instance-specific scope which means that for a multiple-instance database or far sync instance, it is possible that the values of some particular properties may differ between instances. Table 8-1 lists each configurable property and indicates whether the scope of the property is member-wide or instance-specific. If the Scope column contains:

  • Member—The value of the property is database or far sync instance-wide, not instance or configuration specific.

  • Instance—The value of the property is instance specific.

    If there is an asterisk (*) present, it indicates that the property value can be set for all instances of an Oracle RAC database using the EDIT INSTANCE * ON DATABASE command.

  • Configuration—The value of the property is configuration wide, not instance or member specific.

Table 8-1 Configurable Properties

Configurable Property Name Scope Pertains To

AlternateLocation

Instance

Redo transport services

ApplyInstanceTimeout

Member

Redo Apply and SQL Apply

ApplyLagThreshold

Member

Redo transport services

ApplyParallel

Member

Redo Apply

ArchiveLagTarget

Member

Redo transport services

Binding

Member

Redo transport services

DbFileNameConvert

Member

Redo Apply

DelayMins

Member

Redo Apply and SQL Apply

DGConnectIdentifier

Member

Broker communication, Redo transport services

FastStartFailoverTarget

Member

Fast-start failover

LogArchiveFormat

Instance *

Redo transport services

LogArchiveMaxProcesses

Member

Redo transport services

LogArchiveMinSucceedDest

Member

Redo transport services

LogArchiveTrace

Instance *

Diagnosis

LogFileNameConvert

Member

Redo Apply

LogShipping

Member

Redo transport services

LogXptMode

Member

Redo transport services

LsbyMaxEventsRecorded

Member

SQL Apply

LsbyMaxServers

Instance *

SQL Apply

LsbyMaxSga

Instance *

SQL Apply

LsbyPreserveCommitOrder

Member

SQL Apply

LsbyRecordAppliedDdl

Member

SQL Apply

LsbyRecordSkipDdl

Member

SQL Apply

LsbyRecordSkipErrors

Member

SQL Apply

MaxConnections

Member

Redo transport services

MaxFailure

Member

Redo transport services

NetTimeout

Member

Redo transport services

ObserverConnectIdentifier

Member

Fast-start failover

PreferredApplyInstance

Member

Redo Apply and SQL Apply

RedoCompression

Member

Redo transport services

RedoRoutes

Member

Redo transport services

ReopenSecs

Member

Redo transport services

SidName

Instance

Instance identification

StandbyArchiveLocation

Instance

Redo transport services

StandbyFileManagement

Member

Redo Apply and SQL Apply

StaticConnectIdentifier

Instance

Instance Startup and Shutdown

TransportDisconnectedThreshold

Member

Redo transport services

TransportLagThreshold

Member

Redo transport services


See Also:

Chapter 4 for more information about property management

Note:

When a broker configuration with its primary database is created and members are added to the configuration, the broker imports existing settings from the members to set many of the properties. If importing an existing setting fails, or if a property value is not imported, then the broker uses a broker default value. The default values and whether or not a property is imported is indicated within each property description.

Broker Controlled Database Initialization Parameters and SQL Statements

The following database initialization parameters are controlled by broker configurable properties. Therefore, you should not set these parameters manually:

  • LOG_ARCHIVE_DEST_n

  • LOG_ARCHIVE_DEST_STATE_n

  • ARCHIVE_LAG_TARGET

  • DB_FILE_NAME_CONVERT

  • LOG_ARCHIVE_FORMAT

  • LOG_ARCHIVE_MAX_PROCESSES

  • LOG_ARCHIVE_MIN_SUCCEED_DEST

  • LOG_ARCHIVE_TRACE

  • LOG_FILE_NAME_CONVERT

  • STANDBY_FILE_MANAGEMENT

The broker also uses configurable property settings to manage how apply is to be started. Therefore, the following SQL statements are managed automatically by the broker:

  • ALTER DATABASE RECOVER MANAGED STANDBY DATABASE

  • ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE

The broker sets the following apply parameters on a logical standby automatically; you should not manually set them:

  • MAX_EVENTS_RECORDED

  • MAX_SERVERS

  • MAX_SGA

  • PRESERVE_COMMIT_ORDER

  • RECORD_APPLIES_DDL

  • RECORD_SKIP_DDL

  • RECORD_SKIP_ERRORS

8.3.1 AlternateLocation

The AlternateLocation configurable property specifies an alternate disk location to store the archived redo log files in the standby when the location specified by the StandbyArchiveLocation configurable property fails. The property has instance-specific scope, and the location it specifies has to be accessible by the instance.

Category Description
Datatype String
Valid values Directory specification on system where the standby instance is located
Broker default Empty string
Imported? No
Parameter class Dynamic
Role Standby database or far sync instanceFoot 1 
Standby type Physical, logical, or snapshot standby, or a far sync instance
Corresponds to
  • On the standby instance or the far sync instance, the LOCATION attribute for the LOG_ARCHIVE_DEST_n initialization parameter that represents an alternate destination of the local destination that matches the configurable property StandbyArchiveLocation
  • On the primary database, the TEMPLATE attribute for the LOG_ARCHIVE_DEST_n initialization parameter that represents an alternate destination

Scope Instance
Enterprise Manager name Alternate Standby Location

Footnote 1 Although this property is set for the standby instance or far sync instance, it is indirectly related to redo transport services for the primary database. The broker sets up both an alternate local destination on the standby instance or far sync instance and an alternate remote destination on the primary database.

Note:

On a logical standby database, Oracle recommends the LOCATION attribute of the LOG_ARCHIVE_DEST_n initialization parameter for the local destination be different from the value of AlternateLocation configurable property.

8.3.2 ApplyInstanceTimeout

The ApplyInstanceTimeout configurable property specifies the number of seconds the broker waits after detecting the current apply instance failed before initiating the apply instance failover.

Category Description
Datatype Integer
Valid values >=0 (seconds)
Broker default 0 (results in immediate apply instance failover)
Imported? No
Parameter class Not applicable
Role Standby
Standby type Physical or logical
Corresponds to Not applicable
Scope Database
Enterprise Manager name Not applicable

8.3.3 ApplyLagThreshold

The ApplyLagThreshold configurable property generates a warning status for a logical or physical standby when the member's apply lag exceeds the value specified by the property. The property value is expressed in seconds. A value of 0 seconds results in no warnings being generated when an apply lag exists.

Category Description
Datatype Number
Valid values >=0
Broker default 0 seconds
Imported? No
Parameter class Not applicable
Role Standby
Standby type Physical, logical
Corresponds to Not applicable
Scope Database
Enterprise Manager name Not applicable

8.3.4 ApplyParallel

The ApplyParallel configurable property specifies whether Redo Apply should use multiple processes to apply redo data to the physical standby database. If Redo Apply is shut off, then setting the property has no immediate effect. However, when Redo Apply is running again, the value of the property is used to determine the parallel apply behavior of Redo Apply.

Category Description
Datatype String
Valid values
  • AUTO—the number of parallel processes used for Redo Apply is automatically determined by Oracle based on the number of CPUs that the system has.
  • NO—no parallel apply

  • 2, 3, and so on—manually specify the number of parallel processes used for Redo Apply. (Specifying 0 is the same as specifying NO; specifying 1 is the same as specifying AUTO.)

Broker default AUTO
Imported? No
Parameter class Not applicable
Role Standby
Standby type Physical
Corresponds to
  • AUTO corresponds to the PARALLEL clause of the ALTER DATABASE RECOVER MANAGED STANDBY DATABASE statement
  • NO corresponds to the NOPARALLEL clause of the ALTER DATABASE RECOVER MANAGED STANDBY DATABASE statement

  • 2, 3, and so on corresponds to the PARALLEL n clause of the ALTER DATABASE RECOVER MANAGED STANDBY DATABASE statement

Scope Database
Enterprise Manager name Not applicable

8.3.5 ArchiveLagTarget

The ArchiveLagTarget configurable property limits the amount of data that can be lost and, effectively, increases the availability of the standby database or far sync instance by forcing a log switch after the amount of time you specify (in seconds) elapses. That way, the standby database will not miss redo records generated from a time range longer than the value set for the ARCHIVE_LAG_TARGET initialization parameter.

Category Description
Datatype Number
Valid values Seconds (either 0 seconds, or any number from 60 to 7200 seconds)
Broker default 0 (disabled)
Imported? Yes, from the ARCHIVE_LAG_TARGET initialization parameter
Parameter class Dynamic
Role Primary database, far sync instance
Standby type Not applicable
Corresponds to ARCHIVE_LAG_TARGET=seconds initialization parameter
Scope Database, far sync instance
Enterprise Manager name Archive Lag Target

8.3.6 Binding

The Binding configurable property specifies whether the destination is MANDATORY or OPTIONAL.

Category Description
Datatype String
Valid values
  • MANDATORY

    You can specify a policy for reuse of online redo log files using the MANDATORY value. If the archiving operation of a mandatory destination fails, online redo log files cannot be overwritten.

  • OPTIONAL

    You can specify a policy for reuse of online redo log files using the OPTIONAL value. If the archiving operation of an optional destination fails, the online redo log files are overwritten.

Broker default OPTIONAL
Imported? No
Parameter class Dynamic
Role Standby database or far sync instanceFoot 1 
Standby type Physical, logical, or snapshot standby, or a far sync instance
Corresponds to
  • MANDATORY and OPTIONAL attributes for the LOG_ARCHIVE_DEST_n initialization parameter of the database or far sync instance that is sending redo data
  • BINDING column of the V$ARCHIVE_DEST view of the database or far sync instance that is sending redo data

Scope Database, far sync instance
Enterprise Manager name Not applicable

Footnote 1 Although this property is set for the redo destination, it is indirectly related to the redo transport services for the database or far sync instance that is sending redo data. The broker propagates the setting you specify to the corresponding attributes of the LOG_ARCHIVE_DEST_n value of the database or far sync instance that is sending redo data.

8.3.7 DbFileNameConvert

The DbFileNameConvert configurable property distinguishes physical standby datafile filenames from primary datafile filenames. If you add a datafile to the primary database, this property converts the datafile name on the primary database to the datafile on the physical standby database.

This property is used in the following situations:

  • At physical standby mount time, it is used to rename primary datafile filenames to standby datafile filenames if the datafile file path on the physical standby system is different from the primary database system.

  • When a new data file is created on the primary database, a corresponding new data file will be created on the physical standby database if the StandbyFileManagement configurable property is set to 'AUTO'. Oracle uses the data-file file-path mapping information from the DbFileNameConvert property to determine the standby file path of the new standby data file. If the StandbyFileManagement property is set to 'MANUAL', you must add a corresponding file to the physical standby database.

Note:

When a database is added to the configuration, the broker sets the initial value of this property to the in-memory value of the DB_FILE_NAME_CONVERT initialization parameter. It is possible that the in-memory value and server parameter file (SPFILE) value of this parameter will differ. If you want to use the parameter's in-memory value, then enable the database and the broker will ensure that the SPFILE value of the parameter is set to the in-memory value. If you want to use the SPFILE value, then set the property value to be the parameter's value stored in the SPFILE. Then enable the database.
Category Description
Datatype String
Valid values Set the value of this property to a list of string pairs:
  1. The first string is the substring found in the datafile names on the primary database.

  2. The second string is the substring found in the datafile names on the standby database.

For example, ('string1', 'string2', 'string3', 'string4',...)

Where:

  • string1 is the substring of the primary database filename.

  • string2 is the substring of the standby database filename.

  • string3 is the substring of the primary database filename.

  • string4 is the substring of the standby database filename.

Broker default Empty string
Imported? Yes, from the DB_FILE_NAME_CONVERT initialization parameter
Parameter class Static
Role Standby
Standby type Physical
Corresponds to DB_FILE_NAME_CONVERT initialization parameter
Scope Database
Enterprise Manager name DB File Name Convert

8.3.8 DelayMins

The DelayMins configurable property specifies the number of minutes log apply services will delay applying the archived redo log data on the standby database. When the DelayMins property is set to the default value of 0 minutes, log apply services apply redo data as soon as possible.

If the DelayMins property is set to 0, start log apply services as follows:

  • Start Redo Apply on physical standby databases using the following SQL statement:

    ALTER DATABASE RECOVER MANAGED STANDBY DATABASE;
    
  • Start SQL Apply on logical standby databases using the following SQL statement:

    ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE;
    
Category Description
Datatype Integer
Valid values >=0 (minutes)
Broker default 0
Imported? No
Parameter class Dynamic
Role StandbyFoot 1 
Standby type Physical and logical
Corresponds to
  • DELAY attribute for the LOG_ARCHIVE_DEST_n initialization parameter of the database or far sync instance that is sending redo data
  • DELAY_MINS column of the V$ARCHIVE_DEST view of the database or far sync instance that is sending redo data

  • Options used to start Redo Apply and SQL Apply

Scope Database
Enterprise Manager name Apply Delay (mins)

Footnote 1 Although this property is set for the standby database, it is indirectly related to the redo transport services for the database or far sync instance that is sending redo data. The broker propagates the setting you specify on the standby database to the corresponding attributes of the LOG_ARCHIVE_DEST_n value of the database or far sync instance that is sending redo data.

8.3.9 DGConnectIdentifier

The DGConnectIdentifier configurable property specifies the connection identifier the broker uses when making connections to a configuration member. If using DGMGRL, you supply the value when you enter the CREATE CONFIGURATION, ADD DATABASE, or ADD FAR_SYNC command. If you are using Enterprise Manager, the value is supplied automatically. The connect identifier for a configuration member must:

  • Allow all other members in the configuration to reach it.

  • Allow the member to reach itself.

  • Allow all instances of an Oracle RAC database to be reached.

  • Specify a service that all instances dynamically register with the listeners so that connect-time failover on an Oracle RAC database is possible.

  • Have failover attributes set to allow the primary database's Redo Transport Services to continue shipping redo data to an Oracle RAC standby database, even if the receiving instance of that standby database has failed.

The value of this property is specified in the SERVICE attribute of the LOG_ARCHIVE_DEST_n parameter when the broker configures redo transport services on the primary database.

Category Description
Datatype String
Valid values A connect identifier that can be used to connect to this database
Broker default Not applicable
Imported? No
Parameter class Not applicable
Role Primary, standby, far sync instance
Standby type Physical, logical, or snapshot standby, or a far sync instance
Corresponds to SERVICE_NAME attribute of the LOG_ARCHIVE_DEST_n initialization parameter of the configuration member that is sending redo data
Scope Database, far sync instance
Enterprise Manager name Not applicable

8.3.10 FastStartFailoverTarget

The FastStartFailoverTarget configuration property specifies the DB_UNIQUE_NAME of the database that will be the target of a fast-start failover when this database is the primary database. See Step 2 in Section 5.5.2 for more information about setting this property.

The FastStartFailoverTarget configuration property can only be set to the name of a physical or logical standby. It cannot be set to the name of a snapshot standby database or far sync instance.

Category Description
Datatype String
Valid value DB_UNIQUE_NAME of the database that is the target of the fast-start failover.
Broker default If only one physical or logical standby database exists, then the broker selects that as the default value for this property on the primary database when fast-start failover is enabled.

If more than one physical or logical standby database exists, you must specify the FastStartFailoverTarget value explicitly, prior to enabling fast-start failover. The indicated target is verified when fast-start failover is enabled.

For the target standby database, the broker automatically selects the current primary database as the value for this property when fast-start failover is enabled.

Imported? No
Parameter class Not applicable
Role Primary or standby
Standby type Physical or logical
Corresponds to Not applicable
Scope Database
Enterprise Manager name Enterprise Manager displays the value for the current primary database on the Oracle Data Guard Overview page, along with whether or not fast-start failover has been enabled.

8.3.11 LogArchiveFormat

The LogArchiveFormat configurable instance-specific property specifies the format for filenames of archived redo log files using a database ID (%d), thread (%t), sequence number (%s), and resetlogs ID (%r).

Note:

When a member is added to the configuration, the broker sets the initial value of this property to the in-memory value of the LOG_ARCHIVE_FORMAT initialization parameter. It is possible that the in-memory value and server parameter file (SPFILE) value of this parameter will differ. If you want to use the parameter's in-memory value, then enable the member and the broker will ensure that the SPFILE value of the parameter is set to the in-memory value. If you want to use the SPFILE value, then set the property value to be the parameter's value stored in the SPFILE. Then enable the member.
Category Description
Datatype String
Valid values %d_%t_%s_%r
Broker default Empty string
Imported? Yes, from the LOG_ARCHIVE_FORMAT initialization parameter on the primary database
Parameter class Static
Role Primary, standby, far sync instance
Standby type Physical, logical, or snapshot standby, or a far sync instance
Corresponds to LOG_ARCHIVE_FORMAT initialization parameter
Scope Instance (On an Oracle RAC database, you can use the EDIT INSTANCE * ON DATABASE command to have all instances use the same value for this property.)
Enterprise Manager name Not applicable

8.3.12 LogArchiveMaxProcesses

The LogArchiveMaxProcesses configurable property specifies the initial number of archiver processes (ARCn) that are invoked. The actual number of archiver processes in use may increase subsequently based on the archiving workload.

Category Description
Datatype Integer
Valid values 1 to 30
Broker default 4
Imported? Yes, from the LOG_ARCHIVE_MAX_PROCESSES initialization parameter
Parameter class Dynamic
Role Primary, standby, far sync instance
Standby type Physical, logical, or snapshot standby or a far sync instance
Corresponds to LOG_ARCHIVE_MAX_PROCESSES initialization parameter
Scope Database, far sync instance
Enterprise Manager name Archiver Processes

8.3.13 LogArchiveMinSucceedDest

The LogArchiveMinSucceedDest configurable property controls when online redo log files are available for reuse. For the online redo log files to be available for reuse, archiving must succeed to a minimum number of destinations.

Category Description
Datatype Integer
Valid values 1 to 10
Broker default 1
Imported? Yes, from the LOG_ARCHIVE_MIN_SUCCEED_DEST initialization parameter
Parameter class Dynamic
Role Primary database, far sync instance
Standby type Not applicable
Corresponds to LOG_ARCHIVE_MIN_SUCCEED_DEST initialization parameter
Scope Database, far sync instance
Enterprise Manager name Not applicable

8.3.14 LogArchiveTrace

Set the LogArchiveTrace configurable instance-specific property to an integer value to see the progression of the archiving of online redo log files on the primary and the standby databases. The Oracle database writes an audit trail of the archived redo log files received from the primary database into process trace files.

Category Description
Datatype Integer
Valid values A valid value is the sum of any combination of any of the following values:

0: Disable archive redo log tracing

1: Track archiving of online redo log file

2: Track archiving status of each archive redo log destination

4: Track archiving operational phase

8: Track ARCHIVELOG destination activity

16: Track detailed ARCHIVELOG destination activity

32: Track ARCHIVELOG destination parameter modifications

64: Track ARCn process state activity

128: Track FAL (fetch archive log) server related activities

256: Tracks RFS Logical Client

512: Tracks LGWR redo shipping network activity

1024: Tracks RFS physical client

2048: Tracks RFS/ARCn ping heartbeat

4096: Tracks real-time apply activity

8192: Tracks Redo Apply (media recovery or physical standby)

16384: Tracks archive I/O buffers

32768: Tracks LogMiner dictionary archiving

Broker default 255
Imported? Yes, from the LOG_ARCHIVE_TRACE initialization parameter
Parameter class Dynamic
Role Primary, standby, far sync instance
Standby type Physical, logical, or snapshot standby, or a far sync instance
Corresponds to LOG_ARCHIVE_TRACE initialization parameter
Scope Instance (On an Oracle RAC database, you can use the EDIT INSTANCE * ON DATABASE command to have all instances use the same value for this property.)
Enterprise Manager name Log Archive Trace

8.3.15 LogFileNameConvert

The LogFileNameConvert configurable property converts the filename of an online redo log file on the primary database to the filename of a corresponding online redo log file on the physical standby database.

Note:

When a database is added to the configuration, the broker sets the initial value of this property to the in-memory value of the LOG_FILE_NAME_CONVERT initialization parameter. It is possible that the in-memory value and server parameter file (SPFILE) value of this parameter will differ. If you want to use the parameter's in-memory value, then enable the database and the broker will ensure that the SPFILE value of the parameter is set to the in-memory value. If you want to use the SPFILE value, then set the property value to be the parameter's value stored in the SPFILE. Then enable the database.
Category Description
Datatype String
Valid values Set the value of this property to a list of an even number of string pairs, separated by commas.
  1. The first string is the substring found in the datafile names on the primary database.

  2. The second string is the substring found in the datafile names on the standby database.

For example, ('string1', 'string2', 'string3', 'string4',...)

Where:

  • string1 is the substring of the primary database filename.

  • string2 is the substring of the standby database filename.

  • string3 is the substring of the primary database filename.

  • string4 is the substring of the standby database filename.

Broker default Empty string
Imported? Yes, from the LOG_FILE_NAME_CONVERT initialization parameter
Parameter class Static
Role Standby
Standby type Physical database and far sync instance
Corresponds to LOG_FILE_NAME_CONVERT initialization parameter
Scope Database
Enterprise Manager name Log File Name Convert

8.3.16 LogShipping

The broker uses the value of the LogShipping property when the primary database is in the TRANSPORT-ON state or when the physical standby or far sync instance forwards redo data to another member (physical, logical, or snapshot standby, or a far sync instance).

  • If the primary database is in the TRANSPORT-ON state and the value of the LogShipping property is ON, then redo transport services are enabled to send redo data to the particular configuration member. If the LogShipping property is OFF, then redo transport services are disabled to that member.

  • If a configuration member that forwards redo data has its LogShipping property set to ON and the member to which it sends redo data also has its LogShipping property set to ON, then redo transport services are enabled from the member sending redo data to the member that is to receive redo data.

    If a member that forwards redo data has its LogShipping property set to ON but the member to which it sends redo data has its LogShipping property set to OFF, then redo transport services are disabled from the member sending redo data to the member that is to receive redo data.

Category Description
Datatype String
Valid values ON or OFF
Broker default ON
Imported? No
Parameter class Dynamic
Role Standby database and far sync instanceFoot 1 
Standby type Physical, logical, or snapshot standby, or a far sync instance
Corresponds to ENABLE and DEFER values for the LOG_ARCHIVE_DEST_STATE_n initialization parameter of the database or far sync instance that is sending redo data
Scope Database
Enterprise Manager name Log Shipping

Footnote 1 Although this property is set for a standby database or far sync instance, it is indirectly related to the redo transport services for the database or far sync instance that is sending redo data. The broker propagates the setting you specify on the standby database to the corresponding attributes of the LOG_ARCHIVE_DEST_n value of the database or far sync instance that is sending redo data.

8.3.17 LogXptMode

The LogXptMode configurable property enables you to set the redo transport service. You set the redo transport services on each configuration member to one of the following modes:

  • SYNC

    Configures redo transport services for this configuration member using the SYNC and AFFIRM attributes of the LOG_ARCHIVE_DEST_n initialization parameter. Standby redo log files are required. This mode is required for the maximum protection or maximum availability data protection modes. This redo transport service enables the highest grade of data protection to the primary database, but also incurs the highest performance impact.

  • ASYNC

    Configures redo transport services for this configuration member using the ASYNC and NOAFFIRM attributes of the LOG_ARCHIVE_DEST_n initialization parameter. Standby redo log files are required. This mode enables a moderate grade of data protection to the primary database, and incurs a lower performance impact than SYNC.

  • FASTSYNC

    Configures redo transport services for this configuration member using the SYNC and NOAFFIRM attributes of the LOG_ARCHIVE_DEST_n initialization parameter. This mode is only available in maximum availability protection mode. Because FASTSYNC transport mode uses the NOAFFIRM attribute of the LOG_ARCHIVE_DEST_n parameter, data loss is possible.

Category Description
Datatype String
Valid values SYNC, ASYNC, or FASTSYNC
Broker default ASYNC
Imported? No
Parameter class Dynamic
Role Standby database and far sync instanceFoot 1 
Standby type Physical, logical, or snapshot standby, or a far sync instance
Corresponds to
  • SYNC, ASYNC, AFFIRM, and NOAFFIRM attributes for the LOG_ARCHIVE_DEST_n initialization parameter of the database or far sync instance that is sending redo data
  • ARCHIVER, TRANSMIT_MODE, and AFFIRM columns of V$ARCHIVE_DEST view of the database or far sync instance that is sendng redo data

Scope Database, far sync instance
Enterprise Manager name Redo Transport Service

Footnote 1 Although this property is set for the standby database or far sync instance, it is indirectly related to the redo transport services for the database or far sync instance that is sending redo. The broker propagates the setting you specify on the standby database or far sync instance to the corresponding attributes of the LOG_ARCHIVE_DEST_n value of the database or far sync instance that is sending redo data. Note that if a database receives redo from a database or far sync instance where the RedoRoutes property has been configured with a redo transport mode, then the mode specified by that RedoRoutes property value overrides the value of the LogXptMode property.

See Also:

Chapter 4 for more information about setting data protection modes for redo transport services

8.3.18 LsbyMaxEventsRecorded

The LsbyMaxEventsRecorded configurable property specifies the number of events that will be stored in the DBA_LOGSTDBY_EVENTS table, which stores logical standby event information.

Category Description
Datatype Integer
Valid values >=0
Broker default 0
Imported? Yes, from the MAX_EVENTS_RECORDED row of SYSTEM.LOGSTDBY$PARAMETERS
Parameter class Dynamic; SQL Apply does not require restart
Role Standby
Standby type Logical
Corresponds to DBMS_LOGSTDBY.APPLY_SET('MAX_EVENTS_RECORDED') and the DBMS_LOGSTDBY.APPLY_UNSET('MAX_EVENTS_RECORDED') procedures
Scope Database
Enterprise Manager name Max Events Recorded

8.3.19 LsbyMaxServers

The LsbyMaxServers configurable instance-specific property specifies the number of parallel query servers specifically reserved for SQL Apply. If the value is 0, SQL Apply uses all available parallel query servers to read the log files and apply changes.

Category Description
Datatype Integer
Valid values >=0
Broker default 0
Imported? Yes, from the MAX_SERVERS row of SYSTEM.LOGSTDBY$PARAMETERS
Parameter class Dynamic; SQL Apply does not require restart
Role Standby
Standby type Logical
Corresponds to DBMS_LOGSTDBY.APPLY_SET('MAX_SERVERS') and the DBMS_LOGSTDBY.APPLY_UNSET('MAX_SERVERS') procedures
Scope Instance (On an Oracle RAC database, you can use the EDIT INSTANCE * ON DATABASE command to have all instances use the same value for this property.)
Enterprise Manager name Max Servers

8.3.20 LsbyMaxSga

The LsbyMaxSga configurable instance-specific property specifies the number of megabytes for the allocation of SQL Apply cache in the system global area (SGA). If the value is 0, SQL Apply uses one quarter of the value set for the SHARED_POOL_SIZE initialization parameter.

Category Description
Datatype Integer
Valid values >=0
Broker default 0
Imported? Yes, from the MAX_SGA row of SYSTEM.LOGSTDBY$PARAMETERS
Parameter class Dynamic; SQL Apply does not require restart
Role Standby
Standby type Logical
Corresponds to DBMS_LOGSTDBY.APPLY_SET('MAX_SGA') and the DBMS_LOGSTDBY.APPLY_UNSET('MAX_SGA') procedures
Scope Instance (On an Oracle RAC database, you can use the EDIT INSTANCE * ON DATABASE command to have all instances use the same value for this property.)
Enterprise Manager name Max SGA (MB)

8.3.21 LsbyPreserveCommitOrder

The LsbyPreserveCommitOrder configurable property controls whether transactions are committed on the logical standby database in the exact same order in which they were committed on the primary database. Specify one of the following values:

  • TRUE: Transactions are applied to the logical standby database in the exact order in which they were committed on the primary database.

  • FALSE: Transactions containing non-overlapping sets of rows may be committed in a different order than they were committed on the primary database.

Category Description
Datatype String
Valid values TRUE or FALSE
Broker default TRUE
Imported? Yes, from the PRESERVE_COMMIT_ORDER row of SYSTEM.LOGSTDBY$PARAMETERS
Parameter class Static; SQL Apply requires restart
Role Standby
Standby type Logical
Corresponds to DBMS_LOGSTDBY.APPLY_SET('PRESERVE_COMMIT_ORDER') and DBMS_LOGSTDBY.APPLY_UNSET('PRESERVE_COMMIT_ORDER') procedures
Scope Database
Enterprise Manager name Preserve Commit Order

8.3.22 LsbyRecordAppliedDdl

The LsbyRecordAppliedDdl configurable property controls whether or not SQL statements that were applied to the logical standby database are recorded in the DBA_LOGSTDBY_EVENTS table. Specify one of the following values:

  • TRUE: DDL statements applied to the logical standby database are recorded in the DBA_LOGSTDBY_EVENTS table. This is the default setting.

  • FALSE: Applied DDL statements are not recorded.

Category Description
Datatype String
Valid values TRUE or FALSE
Broker default TRUE
Imported? Yes, from the RECORD_APPLIED_DDL row of SYSTEM.LOGSTDBY$PARAMETERS
Parameter class Dynamic; SQL Apply does not require restart
Role Standby
Standby type Logical
Corresponds to DBMS_LOGSTDBY.APPLY_SET('RECORD_APPLIED_DDL') and the DBMS_LOGSTDBY.APPLY_UNSET('RECORD_APPLIED_DDL') procedures
Scope Database
Enterprise Manager name Record Applied DDL

8.3.23 LsbyRecordSkipDdl

The LsbyRecordSkipDdl configurable property controls whether or not skipped DDL statements are recorded in the DBA_LOGSTDBY_EVENTS table. Specify one of the following values:

  • TRUE: Skipped DDL statements are recorded in the DBA_LOGSTDBY_EVENTS table. This is the default setting.

  • FALSE: Skipped DDL statements are not recorded in the DBA_LOGSTDBY_EVENTS table.

Category Description
Datatype String
Valid values TRUE or FALSE
Broker default TRUE
Imported? Yes, from the RECORD_SKIP_DDL row of SYSTEM.LOGSTDBY$PARAMETERS
Parameter class Dynamic; SQL Apply does not require restart
Role Standby
Standby type Logical
Corresponds to DBMS_LOGSTDBY.APPLY_SET('RECORD_SKIP_DDL') and the DBMS_LOGSTDBY.APPLY_UNSET('RECORD_SKIP_DDL') procedures
Scope Database
Enterprise Manager name Record Skip DDL

8.3.24 LsbyRecordSkipErrors

The LsbyRecordSkipErrors configurable property controls whether or not skipped errors (as described by the DBMS_LOGSTDBY.SKIP_ERROR procedure) are recorded in the DBA_LOGSTDBY_EVENTS table. Specify one of the following values:

  • TRUE: Skipped errors are recorded in the DBA_LOGSTDBY_EVENTS table.

  • FALSE: Skipped errors are not recorded in the DBA_LOGSTDBY_EVENTS table.

Category Description
Datatype String
Valid values TRUE or FALSE
Broker default TRUE
Imported? Yes, from the RECORD_SKIP_ERRORS row of SYSTEM.LOGSTDBY$PARAMETERS
Parameter class Dynamic; SQL Apply does not require restart
Role Standby
Standby type Logical
Corresponds to DBMS_LOGSTDBY.APPLY_SET('RECORD_SKIP_ERRORS') and the DBMS_LOGSTDBY.APPLY_UNSET('RECORD_SKIP_ERRORS') procedures
Scope Database
Enterprise Manager name Record Skip Errors

8.3.25 MaxConnections

The MaxConnections configurable property specifies how many ARCn processes will be used in parallel to transmit redo data from a single archived redo log on the database or far sync instance to the archived redo log at the remote site. If the MaxConnections property is set to a value greater than 1, then redo transport services use multiple ARCn processes to transmit redo data to archived redo log files at the remote destinations.

Category Description
Datatype Integer
Valid values 1 to 20
Broker default 1
Imported? No
Parameter class Dynamic
Role Standby
Standby type Physical, logical, or snapshot
Corresponds to
  • LOG_ARCHIVE_MAX_PROCESSES initialization parameterFoot 1 
  • MAX_CONNECTIONS attribute for the LOG_ARCHIVE_DEST_n initialization parameter of the database or far sync instance that is sending redo data

  • MAX_CONNECTIONS column of the V$ARCHIVE_DEST view of the database or far sync instance that is sending redo data

Scope Database
Enterprise Manager name Not applicable

Footnote 1 The LOG_ARCHIVE_MAX_PROCESSES initialization parameter affects the actual number of ARCn processes used by an instance.

8.3.26 MaxFailure

The MaxFailure configurable property specifies the maximum number of contiguous archiving failures before the redo transport services stop trying to transport archived redo log files to the standby database. A value of zero indicates that an unlimited number of failures are allowed.

Category Description
Datatype Integer
Valid values >=0
Broker default 0
Imported? No
Parameter class Dynamic
Role StandbyFoot 1 
Standby type Physical, logical, or snapshot
Corresponds to
  • MAX_FAILURE attribute for the LOG_ARCHIVE_DEST_n initialization parameter of the database or far sync instance that is sending redo data
  • MAX_FAILURE column of the V$ARCHIVE_DEST view of the database or far sync instance that is sending redo data

Scope Database
Enterprise Manager name Not applicable

Footnote 1 Although this property is set for a standby database or far sync instance, it is indirectly related to the redo transport services for the database or far sync instance that is sending redo data. The broker propagates the setting you specify on the standby database or far sync instance to the corresponding attributes of the LOG_ARCHIVE_DEST_n value of the database or far sync instance that is sending redo data.

8.3.27 NetTimeout

The NetTimeout configurable property specifies the number of seconds the LGWR waits for Oracle Net Services to respond to a LGWR request. It is used to bypass the long connection timeout in TCP.

Category Description
Datatype Integer
Valid values 0, 15 to 1200
Broker default 30
Imported? No
Parameter class Dynamic
Role Primary, standby, far sync instance
Standby type Physical, logical, or snapshot standby, or a far sync instance
Corresponds to
  • NET_TIMEOUT attribute of the LOG_ARCHIVE_DEST_n initialization parameter of the database or far sync instance that is sending redo data
  • NET_TIMEOUT column of V$ARCHIVE_DEST view of the database or far sync instance that is sending redo data

Scope Database, far sync instance
Enterprise Manager name Not applicable

8.3.28 ObserverConnectIdentifier

The ObserverConnectIdentifier configurable property specifies a connect identifier that can be used by the observer to connect to this database. This can pertain only to the primary database, or to the target standby database when fast-start failover is enabled.

Category Description
Datatype String
Valid Values A connect identifier that observer can use to connect to this database
Broker Default Empty StringFoot 1 
Imported? No
Parameter Class Not applicable
Role Primary and Standby
Standby Type Physical or logical
Corresponds to Not applicable
Scope Database
Enterprise Manager name Observer Connect Identifier

Footnote 1 When this is Empty String (not set by the user), the connect identifier specified by this database's DGConnectIdentifier property will be used by the observer.

8.3.29 PreferredApplyInstance

The PreferredApplyInstance configurable property indicates that a particular instance is the preferred choice for serving log apply services. It is only used when the database is a standby Oracle RAC database. The value could be an empty string (default) which means the broker chooses the apply instance.

Category Description
Datatype String
Valid Values The instance name (SID) or empty string. Note that on certain platforms, SIDs may be case-sensitive.
Broker Default Empty string
Imported? No
Parameter Class Not applicable
Role Standby
Standby Type Physical or logical
Corresponds to Not applicable
Scope Database
Enterprise Manager name Apply Instance

See Also:

8.3.30 RedoCompression

The RedoCompression configurable property is used to specify whether redo data is transmitted to a standby database or far sync instance in compressed or uncompressed form.

Note:

Redo transport compression is a feature of the Oracle Advanced Compression option. You must purchase a license for this option before using the redo transport compression feature.
Category Description
Datatype String
Valid value DISABLE or ENABLE
Broker Default DISABLE
Imported? No
Parameter class Dynamic
Role Standby database or far sync instanceFoot 1 
Standby type Physical, logical, or snapshot standby, or a far sync instance
Corresponds to
  • COMPRESSION attribute for the LOG_ARCHIVE_DEST_n initialization parameter of the database or far sync instance that is sending redo data
  • COMPRESSION column of the V$ARCHIVE_DEST view of the database or far sync instance that is sending redo data

Scope Database, far sync instance
Enterprise Manager name Not applicable

Footnote 1 Although this property is set for a standby database or far sync instance, it is indirectly related to the redo transport services for the database or far sync instance that is sending redo data. The broker propagates the setting you specify on the standby database or far sync instance to the corresponding attributes of the LOG_ARCHIVE_DEST_n value of the database or far sync instance that is sending redo data.

8.3.31 RedoRoutes

By default, a primary database sends the redo that it generates to every other redo transport destination in the configuration. You can use the RedoRoutes property to create a more complex redo transport topology, such as one in which a physical standby database or a far sync instance forwards redo received from the primary database to one or more destinations, or one in which the redo transport mode used for a given destination is dependent on which database is in the primary role.

The RedoRoutes property is set to a character string that contains one or more redo routing rules. Each rule contains one or more redo sources and one or more redo destinations. A redo routing rule becomes active when one of the redo sources in the rule is in the primary role. This results in redo from the primary database being sent to every redo destination in that rule.

Category Description
Datatype String
Valid values A character string that contains one or more redo routing rules, each contained within a pair of parentheses:
(redo_routing_rule_1) [(redo_routing_rule_n)]

A redo routing rule contains a redo source field and a redo destination field separated by a colon:

(redo source : redo destination)

The redo source field must contain the keyword LOCAL or a comma-separated list of DB_UNIQUE_NAME values:

{LOCAL | db_unique_name_1,[,db_unique_name_n]}
  • The LOCAL keyword is an alias for the local database name. This keyword cannot be used at a far sync instance.

  • A database cannot be specified as a redo source in more than one redo routing rule defined at a given database, either explicitly or implicitly through use of the LOCAL keyword.

The redo destination field must contain the keyword ALL or a comma-separated list of database names, each of which can be followed by an optional redo transport attribute:

{ALL [attribute] | db_unique_name_1 [attribute] [,db_unique_name_n [attribute]]}
  • The ALL keyword is an alias for all possible destinations in the configuration.

The optional redo transport attribute specifies the redo transport mode to use to send redo to the associated destination. It can have one of three values:

[ASYNC | SYNC | FASTSYNC]

If the redo transport attribute is not specified, then the redo transport mode used will be the one specified by the LogXptMode property for the destination.

The following usage notes apply:

  • The RedoRoutes property has a default value of NULL, which is treated as (LOCAL : ALL) at a primary database.

  • A redo routing rule is active if its redo source field specifies the current primary database. If a rule is active, primary database redo is sent by the database at which the rule is defined to each destination specified in the redo destination field of that rule.

  • The ASYNC redo transport attribute must be explicitly specified for a cascaded destination to enable real-time cascading to that destination.

  • The RedoRoutes property cannot be set on a logical or snapshot standby database.

Broker default Null
Imported? No
Parameter class Not applicable
Role Primary, standby, far sync instance
Standby type Physical standby and far sync instance
Corresponds to LOG_ARCHIVE_DEST_n
Scope Database, far sync instance
Enterprise Manager Name RedoRoutes

8.3.32 ReopenSecs

The ReopenSecs configurable property specifies the minimum number of seconds before the archiver process (ARCn, foreground, or log writer process) should try again to access a previously failed destination.

Category Description
Datatype Integer
Valid values >=0 seconds
Broker default 300
Imported? No
Parameter class Dynamic
Role Standby database or far sync instanceFoot 1 
Standby type Physical, logical, or snapshot standby, or a far sync instance
Corresponds to
  • REOPEN attribute for the LOG_ARCHIVE_DEST_n initialization parameter of the database or far sync instance that is sending redo data
  • REOPEN_SECS column of the V$ARCHIVE_DEST view of the database or far sync instance that is sending redo data

Scope Database, far sync instance
Enterprise Manager name Not applicable

Footnote 1 Although this property is set for a standby database or far sync instance, it is indirectly related to the redo transport services for the database or far sync instance that is sending redo data. The broker propagates the setting you specify on the standby database or far sync instance to the corresponding attributes of the LOG_ARCHIVE_DEST_n value of the database or far sync instance that is sending redo data.

8.3.33 SidName

The SidName configurable property specifies the Oracle System Identifier (SID) of the instance. The property can only be updated when broker management of the database is disabled. You should only update the value when the SID is changed, in which case you need to disable broker management of the database, update the SidName property to match with the new SID, and reenable broker management of the database.

Note:

If no existing instance in the broker configuration, for the database whose name matches this instance's db_unique_name, has a SidName property with a value that matches this instance's actual SID, then the broker creates a new instance for this database that has this instance's db_unique_name.
Category Description
Datatype String
Valid values SID of the instance. Note that on certain platforms, SIDs may be case-sensitive.
Broker default Not applicable
Imported? Yes
Parameter class Not applicable
Role Primary and standby
Standby type Physical, logical, or snapshot
Corresponds to INSTANCE_NAME column of the V$INSTANCE view
Scope Instance
Enterprise Manager name Not applicable

See Also:

Oracle Database Administrator's Guide for more information about SIDs

8.3.34 StandbyArchiveLocation

The StandbyArchiveLocation configurable property specifies the location of archived redo log files arriving from a redo source. Oracle recommends that you always explicitly set the value.

Category Description
Datatype String
Valid values Nonempty file specification of the location of archived redo log files on the database or far sync instance. Specify USE_DB_RECOVERY_FILE_DEST if a database recovery area is desired.
Broker default dgsby_db_unique_name
Imported? Yes, from the DESTINATION column of the V$ARCHIVE_DEST fixed view of the standby database or far sync instance where the destination is a local destination and where the VALID_FOR attribute is compatible with the string (STANDBY_ROLE, STANDBY_LOGFILE); if no such destination exists, import is from the STANDBY_ARCHIVE_DEST initialization parameter. Note that the STANDBY_ARCHIVE_DEST parameter has been deprecated and is supported for backward compatibility only.
Parameter class Dynamic
Role Standby database or far sync instance
Standby type Physical, logical, or snapshot standby, or a far sync instance
Corresponds to
  • LOCATION attribute of the LOG_ARCHIVE_DEST_n initialization parameter of the standby database or far sync instance with VALID_FOR compatible with (STANDBY_ROLE, STANDBY_LOGFILE)
  • DESTINATION column of the V$ARCHIVE_DEST view of the standby database

Scope Instance
Enterprise Manager name Standby Archive Location

Note:

On a logical standby database, Oracle recommends the LOCATION attribute of the LOG_ARCHIVE_DEST_n initialization parameter for the local destination be different from the value of StandbyArchiveLocation property, unless you are using a database recovery area.

8.3.35 StandbyFileManagement

The StandbyFileManagement configurable property affects how the add datafile operation on the primary database is applied on the standby database. If this property is set to AUTO, in conjunction with valid settings in the DbFileNameConvert configurable property, a corresponding new datafile is automatically created on the standby database. The location of this new standby datafile is determined by the value of the DbFileNameConvert property.

If this property is set to MANUAL, you have to create the correct new datafile on the standby database manually.

Category Description
Datatype String
Valid values AUTO or MANUAL
Broker default AUTO
Imported? Yes, from the STANDBY_FILE_MANAGEMENT initialization parameter
Parameter class Dynamic
Role Standby
Standby type Physical or snapshot
Corresponds to STANDBY_FILE_MANAGEMENT initialization parameter
Scope Database
Enterprise Manager name Not applicable

8.3.36 StaticConnectIdentifier

The StaticConnectIdentifier configurable instance-specific property specifies the connection identifier that the DGMGRL client will use when starting database instances. If this property has a null value, then the DGConnectIdentifier value is used for operations that involve shutting down and starting up the instance.

Category Description
Datatype String
Valid values A connect identifier that refers to a service that is statically registered.
Broker default Connect descriptor that is the concatenation of:Foot 1 
  • The ADDRESS attribute value of the listener that is specified for the LOCAL_LISTENER initialization parameter

  • The value for the SERVICE_NAME attribute will be set to a concatenation of db_unique_name_DGMGRL.db_domain

Imported? Yes, from the LOCAL_LISTENER and DB_UNIQUE_NAME initialization parameters.
Parameter class Not applicable
Role Primary and standby
Standby type Physical, logical, or snapshot
Corresponds to Not applicable
Scope Instance
Enterprise Manager name Not applicable

Footnote 1 If the instance specified by the SidName property is started on a different host (read from the HOST_NAME column of the V$INSTANCE view) than the host on which it had been previously started, the broker automatically updates the default value of the StaticConnectIdentifier property to incorporate the current ADDRESS attribute of the listener that is specified for the LOCAL_LISTENER initialization parameter.

See Also:

8.3.37 TransportDisconnectedThreshold

The TransportDisconnectedThreshold configurable property can be used to generate a warning status for a logical, physical, or snapshot standby, or a far sync instance when the last communication from the primary database exceeds the value specified by the property. The property value is expressed in seconds. A value of 0 seconds results in no warnings being generated.

Category Description
Datatype Number
Valid values >=0
Broker default 30 seconds
Imported? No
Parameter class Not applicable
Role Standby database or far sync instance
Standby type Physical, logical, or snapshot standby, or a far sync instance
Corresponds to Not applicable
Scope Database, far sync instance
Enterprise Manager name Not applicable

8.3.38 TransportLagThreshold

The TransportLagThreshold configurable property can be used to generate a warning status for a logical, physical, or snapshot standby, or a far sync instance when the member's transport lag exceeds the value specified by the property. The property value is expressed in seconds. A value of 0 seconds results in no warnings being generated when a transport lag exists.

Category Description
Datatype Number
Valid values >=0
Broker default 0 seconds
Imported? No
Parameter class Not applicable
Role Standby database or far sync instance
Standby type Physical, logical, or snapshot standby, or a far sync instance
Corresponds to Not applicable
Scope Database, far sync instance
Enterprise Manager name Not applicable